distutils.errors.DistutilsClassError: command class <class 'setuptools.command.egg_info.egg_info'> must subclass Command

[ddelange]

As suggested in pypa/setuptools#2376 / https://github.com/pypa/setuptools/blob/master/CHANGES.rst#v5010, here an example issue of pypa/distutils breaking installation of a package.

refs:
pypa/setuptools#2355
anhaidgroup/py_stringmatching#64

$ python -c "from packaging.markers import default_environment; print(default_environment())"
{'implementation_name': 'cpython', 'implementation_version': '3.7.5', 'os_name': 'posix', 'platform_machine': 'x86_64', 'platform_release': '18.7.0', 'platform_system': 'Darwin', 'platform_version': 'Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64', 'python_full_version': '3.7.5', 'platform_python_implementation': 'CPython', 'python_version': '3.7', 'sys_platform': 'darwin'}
$ pip list | grep -e setuptools -e pip
pip                             20.2.2
setuptools                      50.1.0
$ SETUPTOOLS_USE_DISTUTILS=local pip install py-stringmatching
Looking in indexes: https://travis:****@pypi.scoutbee.co/repository/data/simple/, https://pypi.org/simple
Collecting py-stringmatching
  Using cached py_stringmatching-0.4.1.tar.gz (646 kB)
    ERROR: Command errored out with exit status 1:
     command: /Users/david.de-lange/.pyenv/versions/vv/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/zf/tbwgf1fx1dvgvmvwdn7_vg3w0000gn/T/pip-install-ov4impok/py-stringmatching/setup.py'"'"'; __file__='"'"'/private/var/folders/zf/tbwgf1fx1dvgvmvwdn7_vg3w0000gn/T/pip-install-ov4impok/py-stringmatching/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/zf/tbwgf1fx1dvgvmvwdn7_vg3w0000gn/T/pip-pip-egg-info-esg39fop
         cwd: /private/var/folders/zf/tbwgf1fx1dvgvmvwdn7_vg3w0000gn/T/pip-install-ov4impok/py-stringmatching/
    Complete output (17 lines):
    /Users/david.de-lange/.pyenv/versions/vv/lib/python3.7/site-packages/_distutils_hack/__init__.py:30: UserWarning: Setuptools is replacing distutils.
      warnings.warn("Setuptools is replacing distutils.")
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/zf/tbwgf1fx1dvgvmvwdn7_vg3w0000gn/T/pip-install-ov4impok/py-stringmatching/setup.py", line 144, in <module>
        zip_safe=False
      File "/Users/david.de-lange/.pyenv/versions/vv/lib/python3.7/site-packages/setuptools/__init__.py", line 153, in setup
        return distutils.core.setup(**attrs)
      File "/Users/david.de-lange/.pyenv/versions/vv/lib/python3.7/site-packages/setuptools/_distutils/core.py", line 134, in setup
        ok = dist.parse_command_line()
      File "/Users/david.de-lange/.pyenv/versions/vv/lib/python3.7/site-packages/setuptools/_distutils/dist.py", line 484, in parse_command_line
        args = self._parse_command_opts(parser, args)
      File "/Users/david.de-lange/.pyenv/versions/vv/lib/python3.7/site-packages/setuptools/dist.py", line 903, in _parse_command_opts
        nargs = _Distribution._parse_command_opts(self, parser, args)
      File "/Users/david.de-lange/.pyenv/versions/vv/lib/python3.7/site-packages/setuptools/_distutils/dist.py", line 548, in _parse_command_opts
        "command class %s must subclass Command" % cmd_class)
    distutils.errors.DistutilsClassError: command class <class 'setuptools.command.egg_info.egg_info'> must subclass Command
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

[jaraco]

Thanks for the report. In this case, the issue lies entirely with Setuptools and Setuptools' adoption of distutils, so I'm going to close this in favor of pypa/setuptools#2355.